the Romance language spoken in Portugal and Brazil
"Many tourists learned Portuguese so they could communicate with locals while visiting Lisbon and Rio de Janeiro."
a native or inhabitant of Portugal
"During their travels, they met several friendly Portuguese who shared stories about Lisbon."
A person native to, or living in, Portugal.
"The portuguese traveler shared stories of his adventures along the coast of Portugal."
In plain English: A Portuguese is someone who was born in Portugal or has that country as their home nation.
"We spoke Portuguese to communicate with our new neighbors in Lisbon."
of or relating to or characteristic of Portugal or the people of Portugal or their language
"Portuguese wines"
Of or pertaining to the region of Portugal.
"The local cuisine features many dishes that are distinctly Portuguese."
In plain English: Something Portuguese is related to Portugal, its people, language, or culture.
"She speaks Portuguese fluently because she lived in Brazil for several years."
The word comes directly from Portuguese, where it originally referred to a native speaker of the language or someone from Portugal. It is essentially a self-designation that entered English through direct borrowing.